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surely you can? take any good set of dithered subs (maybe use 30? for convenience) that you already have that has reasonably sharp detail - use that as the starting point and stack them to generate a reference image. Then software bin those subs 3x3 to get an undersampled set of subs - and then 3x3 drizzle stack the binned subs to get back to the original scale. compare the drizzle restoration result with the original stack and see how much degradation there has been - and how much detail you can recover. That should tell you how much use 3x3 drizzle is.
your D700 may well have an anti-aliasing filter, which will limit the FWHM?
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